What's the name of that National Park in Wyoming?,
Yellowstone National Park, which was inaugurated by former US President Ulysses S.Grant in 1872, is primarily in the US state of Wyoming although it is so vast that parts of it extend into the states of Montana and Idaho as well.
Yellowstone National Park, established by the U.S. Congress and signed into law by 1872, is a national park located primarily in the U.S. State of Wyoming.